Rapid ceramic processing techniques and equipment

Patent metadata

Field	Value
Publication number	US-2025050536-A1
Application number	US-202418776978-A
Country	US
Kind code	A1
Filing date	Jul 18, 2024
Priority date	Mar 9, 2021
Publication date	Feb 13, 2025
Grant date	—

Abstract

Provided herein are rapid, high quality film sintering processes that include high-throughput continuous sintering of lithium-lanthanum zirconium oxide (lithium-stuffed garnet). The instant disclosure sets forth equipment and processes for making high quality, rapidly-processed ceramic electrolyte films. These processes include high-throughput continuous sintering of lithium-lanthanum zirconium oxide for use as electrolyte films. In certain processes, the film is not in contact with any surface as it sinters (i.e., during the sintering phase).

First claim

1 .- 32 . (canceled)

33 . A continuous manufacturing line (CML) comprising:
at least one furnace between a front roller and an end roller comprising a sintering section; the sintering section comprising: three or more speed bumps deposed on a runway; and at least one atmospheric controller which controls at least one condition in the at least one furnace selected from the group consisting of gas flow rate, flow direction, gas composition, pressure, and a combination thereof; wherein the gas composition comprises an atmosphere of Ar, N 2 , H 2 O, H 2 , or a combination thereof.

34 . The CML of claim 33 , wherein a bilayer is wound onto the front roller, wherein the bilayer comprises a metal layer and a green body layer; wherein the metal layer contacts the front roller; and wherein the speed bumps create airspace between the metal layer and the runway.

35 . The CML of claim 33 , wherein the runway is a flat runway.

36 . The CML of claim 33 , wherein the runway is a curved runway.

37 . The CML of claim 33 , wherein the at least one furnace further comprises (a) a binder burn-out section; and (b) a bisque section.

38 . The CML of claim 37 , further comprising a pressurized gas line between the bisque section and the sintering section that pumps gas into the bisque section and into the sintering section.

39 . The CML of claim 37 , wherein the at least one atmospheric controller maintains an atmosphere comprising less than 500 ppm O 2 in the bisque section, the sintering section, or both the bisque section and the sintering section.

40 . The CML of claim 37 , wherein the flow rate in the binder burn-out section is higher than the flow rate in the sintering section.

41 . The CML of claim 33 , wherein the at least one atmospheric controller flows gas over an inlet and/or an outlet of the furnace.

42 . The CML of claim 41 , wherein the gas flow rate is between 1 L/min to 50 L/min at standard pressure and temperature.

43 . The CML of claim 33 , wherein the at least one atmospheric controller injects gas in a laminar flow from a center of the furnace to both ends of the furnace.

44 . The CML of claim 33 , wherein the at least one atmospheric controller maintains a reducing atmosphere in the sintering section.

45 . The CML of claim 33 , wherein the CML is configured for more than one tape speed.

46 . The CML of claim 33 , wherein the H 2 gas is present at about 1, 2, 3, 4, or 5% v/v.

47 . The CML of claim 33 , wherein the bilayer is oriented for curtain processing as it moves through the CML.

48 . The CML of claim 33 , wherein the bilayer is oriented for vertical processing as it moves through the CML.

49 . The CML of claim 33 , wherein the metal layer comprises a metal selected from the group consisting of nickel (Ni), iron (Fe), copper (Cu), platinum (Pt), gold (Au), silver), an alloy thereof, and a combination thereof.

50 . The CML of claim 49 , wherein the metal layer is an alloy of Fe and Ni, and the amount of Fe is 1% to 25% (w/w) with the remainder being Ni.

51 . The CML of claim 33 , wherein the green body layer comprises an oxide.

52 . The CML of claim 33 , wherein the green body layer comprises lithium-stuffed garnet.

53 . The CML of claim 33 , wherein the CML is configured to move the bilayer through the at least one furnace at a rate of at least 2 inches per minute.

54 . The CML of claim 33 , wherein the three or more speed bumps are spaced at least one inch between each other.

55 . The CML of claim 34 , wherein the metal layer has a thickness of 1 μm to 10 μm.

56 . A process of using a continuous manufacturing line, comprising the following operations:
(a) providing, or having provided, a CML as in claim 33 ; (b) sintering a green bilayer while moving the green bilayer through the at least one furnace to produce a sintered bilayer, and (c) winding the sintered bilayer onto an end roller.

Assignees

• Quantumscape Battery Inc

Inventors

• Holme Timothy
• Winterkorn Martin M
• Olenick John
• Berkstresser David
• Sheffield Matthew
• Mohan Yamini
• Zhou Yi
• Broganer Lucas

Classifications

• C04B2237/706

  of one or more of the metallic layers or articles · CPC title

• C04B2237/405

  Iron metal group, e.g. Co or Ni · CPC title

• C04B2237/348

  Zirconia, hafnia, zirconates or hafnates · CPC title

• C04B2235/764

  Garnet structure A3B2(CO4)3 · CPC title

• C04B2235/6584

  at an oxygen percentage below that of air · CPC title